观察下列式子:
;
;
;
,按此规律,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
_____________ =______________ (用含n的代数式表示,其中n为正整数),并计算![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72aacd20f93a325d53745ca893711bbb.png)
________________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d816a85c5ff8a934d5ce8c8e4cdf289.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2426053cb6292a4f01cc92624cfc0b2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0526ea483d40d01e2fb09e0d4e200f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ae285347f0cb00f242caa5809c9473.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f7fda69e2b32b9ced2239f915fa59b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72aacd20f93a325d53745ca893711bbb.png)
更新时间:2020-03-01 21:41:51
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【推荐2】如图,将正整数从点O开始,依次按如图所示的方式在格点(横线和竖线的交点)上排布,点O表示的数是1,第1个拐角处点
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